Journal article
ZEUS results on the measurement and phenomenology of F2 at low x and low Q2
The European physical journal. C, Particles and fields, Vol.7(4), pp.609-630
03/1999
DOI: 10.1007/s100529901084
Abstract
Measurements of the proton structure function F2 for 0.6 < Q2 < 17 GeV2 and 1.2 × 10-5 < cursive Greek chi < 1.9 × 10 -3 from ZEUS 1995 shifted vertex data are presented. From ZEUS F2 data the slopes dF2/d ln Q2 at fixed cursive Greek chi and din F2/d ln(1/cursive Greek chi) for cursive Greek chi < 0.01 at fixed Q2 are derived. For the latter, E665 data are also used. The transition region in Q2 is explored using the simplest non-perturbative models and NLO QCD. The data at very low Q2 ≤ 0.65 GeV2 are described successfully by a combination of generalised vector meson dominance and Regge theory. From a NLO QCD fit to ZEUS data the gluon density in the proton is extracted in the range 3 × 10-5 < cursive Greek chi < 0.7. Data from NMC and BCDMS constrain the fit at large cursive Greek chi. Assuming the NLO QCD description to be valid down to Q2 ∼ 1 GeV2, it is found that the qq̄ sea distribution is still rising at small cursive Greek chi and the lowest Q2 values whereas the gluon distribution is strongly suppressed.
Details
- Title: Subtitle
- ZEUS results on the measurement and phenomenology of F2 at low x and low Q2
- Creators
- ZEUS CollaborationJ Repond (Contributor) - Physics and AstronomyU Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.7(4), pp.609-630
- DOI
- 10.1007/s100529901084
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Language
- English
- Date published
- 03/1999
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627217102771
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